Accession Number : ADA314604

Title :   Underwater Imaging with Acoustic Lenses: Image Processing and Visualization,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC ADVANCED INFORMATION TECHNOLOGY BRANCH

Personal Author(s) : Kamgar-Parsi, Behzad

PDF Url : ADA314604

Report Date : 30 AUG 1996

Pagination or Media Count : 29

Abstract : This report discusses image processing, scene reconstruction, and visualization techniques used for underwater acoustic images taken with lens-based systems from a stationary platform. These systems are designed for high-resolution imaging of objects from distances of a few meters. The acoustic lenses used for beamforming in the imaging systems are made of crystal polystyrene and are cut in cylindrical or spherical shapes. The cylindrical lens has a fan-shaped beam pattern and produces a 2D intensity image or shadowgram, while the spherical lens with a cone-shaped beam produces a 3D intensity image. Test images obtained by the spherical lens contain a remarkable degree of detail.

Descriptors :   *ACOUSTIC IMAGES, *UNDERWATER ACOUSTICS, *ACOUSTIC LENSES, ALGORITHMS, IMAGE PROCESSING, INTENSITY, BACKSCATTERING, HIGH RESOLUTION, THREE DIMENSIONAL, IMAGE INTENSIFICATION, BEAM FORMING, PATTERN RECOGNITION, FOCUSING, DATA DISPLAYS, FOCAL PLANES, ACOUSTIC DATA, SONAR TRANSDUCERS, BACKGROUND NOISE, LOW PASS FILTERS, ACOUSTIC REFLECTION, SCANNING SONAR.

Subject Categories : Acoustic Detection and Detectors
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE